The climate in Belfast during September can be summarized as mild and a little damp.
September is in the fall / autumn in Belfast and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 9°C (49°F) is normal.
Daytime temperature | 20.2°C 68.4°F |
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Nightly temperature | 9.2°C 48.6°F |
Average temperature | 14.7°C 58.5°F |
Daily sunshine | 7 hrs |
Avg rainfall | 91 mm 3.6 ins |
Rainy days | 10 days |
Sea temperature | 14.1°C 57.4°F |
Humidity | 79% |
Windspeed | 12.6kph 8 mph |
On average September is the 6th driest month of the year in Belfast with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 7 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Belfast in September 2024.
Best places to visit in September
Hottest month: | July | 25.5°C 77.9°F |
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Driest month: | February | 78mm 3.1ins |
Sunniest month: | August | 8.2hrs |
Coldest month: | January | -2.3°C 27.9°F |
Wettest month: | November | 116mm 4.6ins |